Added direct Telephreak access with KP + 777 + ST, DISA dialtone at KP + 2602 + ST for DTMF access and stacking experiments, and KP + 199 + ST for a 2600 Hz supervision test. Also documented a few alternate ways to access the system, including the Collector's Net, Free World Dialup, and direct Asterisk connection. See the first post in this thread for an updated listing.
Please do not abuse the Telephreak link.
For stacking, apply and remove 2600 Hz for at least 1 second, wait for the wink, then MF dial KP + 2602 + ST. When you hear the dialtone, dial DTMF 2602, wait for another dialtone and dial 2602, etc. up to 24 loops. On the last dialtone dial a PSTN number (10 digits only). Press a DTMF key on the originating phone to "flash forward". You can hear a click for each link in the stack on the terminating end. Hang up the originating end while listening to the terminating end. Hear a cheep of 2600 for each link in the stack as the call disconnects. Works only from originating end to terminating end.
You can also DTMF dial any of the other codes listed at the DISA dialtone, without the KP and ST, of course.
The 2600 supervision test places 2600 Hz into the SF trunk from the terminating end at busy signal and reorder timings. You can hear the action of the SF notch filter as it creates a beep for each application and removal of 2600. If dialed through a non-SF trunk, you would here a steady 2600 for each flash. The Asterisk DSP notch filter gives a brief 2600 chirp when 2600 is applied or removed. The reverse 2600 will not "blow off" or disconnect the call, as I have the supervision in that direction disabled to "goody" the arrangement (allow multiple call attempts, using 2600 Hz to reset the trunk without having to redial trunk access). The notch filter is still active, though.
Edited by df99, 18 December 2007 - 10:36 AM.